Museum Koenig - or to give it its full name, the Alexander Koenig Zoological Museum - is one of the largest natural history museums in the world. 

Opened in 1934, its displays cover a diversity of wildlife and their habitats. 

A highlight is the excellent "Our Blue Planet" exhibit showcasing ecosystems through a series of fascinating dioramas, including the African Savannah, tropical rainforests, and Polar Regions. Guided tours are available.